Updating to latest masters

Deployed new service (531bfb404ce39debfc028c3c2ae72e7f1c59d661):
* Use article title as download filename (bug 71720, bug 71286).
* The `rl` writer should be an alias for `rdf2latex`.
  (Fixes "I got plaintext when I tried to download my PDF using an old link".)
* Ignore backwards-compatibility `settings` field in metabook.

Deployed new bundler (f55bf164145bd1390a565480a87e04cc640deba4):
* Properly resolve URLs to decode titles.
  Fixes [[:en:AC-130A/E/H/U Spectre/Spooky/Pave Pronto/Plain Jain/Surprise Package]].

Deployed new latexer (fdde609f819679eca109d6a49851bf1e70006172):
* Support Lao, Khmer, Tibetan, Macedonian, Aramaic, and Bosnian.
* Improve CJK support.
* Be careful about square brackets inside `\item[...]`.
* Support djvu images, but only extract first page by default.
  Note that djvu images will be skipped until
  https://gerrit.wikimedia.org/r/165329 is deployed.
* Use narrower margins.
* Equations should be flush left and not indented (bug 68838).

Change-Id: Ib770234ac69f60469b4267542f0e0d413e1c7aed